Allen-Bradley 1785-L20E/E PLC-5/20E Processor Module

FAQ

Q1. What is the 1785-L20E/E used for?
It is a PLC-5/20E processor used for industrial automation control with built-in Ethernet communication.

Q2. What is the difference between L20B and L20E?
The L20E/E includes integrated Ethernet, while L20B does not have native Ethernet capability.

Q3. What memory capacity does it have?
It provides 16K words of battery-backed SRAM.

Q4. What communication networks does it support?
It supports Ethernet, DH+, Remote I/O, and serial communication.

Q5. How many I/O points can it handle?
Up to 512 I/O points depending on configuration.

Q6. What chassis is it installed in?
It is installed in a 1771 I/O chassis used in PLC-5 systems.

Q7. Does it require a battery?
Yes, a lithium battery is required for memory retention when power is off.

Q8. Is it still in production?
No, it is a legacy/discontinued PLC-5 Ethernet processor.

1785-L20E/E Allen Bradley

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